NDS 913B 5" Satin Brass Square Grate with Collar, Connects to 3" Pipse and 4" Fittings. Stormwater flows in, while leaves and debris are blocked from entering and potentially clogging the pipeline. Features an open surface area of 2.5 sq. in. and 8 GPM flow rate. Ideal for draining light flows from small lawns, landscaped areas, patios, and walkways. The 5 in. Square Grate with Collar connects to 3 in. sewer and drain pipe, 3 in. triple-wall pipe, and 4 in. sewer and drain fittings. The brass grate is resistant to rust and corrosion, and fitted onto a polyvinyl chloride (PVC) collar treated with UV inhibitors. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.